Yes I know that. For example civ 4 turn times worsened late game due to trade routes mechanic where cities would do calculations to get best trade routes every turn. But in case of civ 5 it was even worse. Part of it could be due to bad AI (constantly swapping troops needlessly) & 1UPT (units traffic problem). But I would argue that there were some serious optimization issues as well, quite worse than civ 4 IMHO which wasn't perfect by any stretch. For example when loading a save game, ciV had hard time rendering maps quickly unlike previous titles. Sent from my HTC Desire 820s dual sim using Tapatalk